<template>
  <ul class="app-header-nav">
    <li class="home"><RouterLink to="/">首页</RouterLink></li>
    <li v-for="item in list" :key="item.id" @mouseenter="show(item)" @mouseleave="hide(item)" @click="hide(item)">
      <router-link :to="`/category/${item.id}`">{{item.name}}</router-link>
      <div class="layer" :class="{open:item.open}">
        <ul>
          <li v-for="sub in item.children" :key="sub.id" @click="hide(item)">
            <router-link :to="`/category/sub/${sub.id}`">
              <img :src="sub.picture" alt="">
              <p>{{sub.name}}</p>
            </router-link>
          </li>
        </ul>
      </div>
    </li>
  </ul>
</template>

<script>
    import { useStore } from 'vuex';
    import { computed } from 'vue';

    export default {
        name: 'AppHeaderNav',
        setup() {
          const store = useStore()
          const list = computed(()=>{
              return store.state.category.list
          })
          const show = (item) =>{
            store.commit('category/show',item.id)
          }
          const hide = (item) =>{
            store.commit('category/hide',item.id)
          }
          return {list,show,hide}          
        }
}
</script>

<style scoped lang='less'>
    .app-header-nav {
        width: 820px;
        display: flex;
        justify-content: space-around;
        padding-left: 40px;
        position: relative; 
        z-index: 998;  
        > li {
            margin-right: 40px;
            width: 38px;
            text-align: center; 
            > a {
            font-size: 16px;
            line-height: 32px;
            height: 32px;
            display: inline-block;
            }
            &:hover {  
            > a {
                color: @xtxColor;
                border-bottom: 1px solid @xtxColor;
            }
            /* > .layer {
                height: 132px;
                opacity: 1;
            } */
            }
        }
        }
        .layer {
             &.open {
              height: 132px;
                opacity: 1;
             }
            width: 1240px;
            background-color: #fff;
            position: absolute;
            left: -200px;
            top: 56px;
            height: 0;
            overflow: hidden;
            opacity: 0;
            box-shadow: 0 0 5px #ccc;
            transition: all .2s .1s;
        ul {
            display: flex;
            flex-wrap: wrap;
            padding: 0 70px;
            align-items: center;
            height: 132px;
            li {
            width: 110px;
            text-align: center;
            img {
                width: 60px;
                height: 60px;
            }
            p {
                padding-top: 10px;
            }
            &:hover {
                p {
                color: @xtxColor;
                }
            }
            }
        }
    }
</style>